Alexander watt



(No Model.)

A. WATT. ELECTRIC DRIVING APPARATUS FOR GENTRIPUGAL MACHINES. No.316.317.

Patented Apr, 21, 1885.

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UNITED STATES-PATENT OFFICE.

ALEXANDER WATT, OF-LIVERIOOL, COUNTY. OF LANCASTER, ENGLAND.

ELECTRIC DRIVING APPARATUS FOR CENTRIFUGAL MACHINES.

SPECIFICATION forming part of Letters Patent No. 316,317, dated April21, 1885.

Application filed June 19, 1Sf3l. (No model.)

To aZZ whom it may concern.-

Befit known that I, ALEXANDER WVATT, of Liverpool, in the county ofLancaster, in the Kingdom of England, have invented certain new anduseful Improvements in Electrical- Driving Apparatus for CentrifugalMachines, of which the following is a specification.

The object of this invention is further improvements in the driving ofcentrifugal machines than those described in the specification'of anapplication for Letters Patent which accompanies this; and it isdesigned for driving centrifugal machines suspended from an elasticjoint or buffer, which allows of oscillation to the cage, such as isdescribed in the specifications of WVestons patents. It is bestdescribed by aid of the accompanying drawings, in which- Figure 1 is asectional elevation, and Fig. 2 a sectional plan on lines a: 00.

In these, Ais the point of suspension of the fixed shaft 0; B, thedrivingspindle; O, the inner or supporting spindle, suspended from thebracket D by india-rubber or other elastic buffers E. The bracket D issecurely fixed to the girder F or other strong overhead support. Thespindle G is fixedthat is to say, it does not revolve, but, beingsupported on elastic bufi'ers, allows a certain amount of oscillation atits lower end, the center point of suspension being practically freefrom oscillation.

c are steel washers resting on a nut, c, at the lower end of spindle O.

b is a brass bush or sleeve securely attached to the revolving spindle Bby a pin, 2), as shown, or by a nut screwed over the upper flanges orotherwise, and, resting on the washers c, sustains the weight of thecage revolving freely round the fixed spindle 0. As this, however, formsno part of my invention, further description is unnecessary.

G is a bracket fixed to and revolving with the spindle B, and formingpart of the fieldmagnet which takes the place of the drivingpulley toconvey motion to the machine.

H is a triple electro-magnet rotating with shaft 13, and having poles NS. I is the commutator, placed with its axis on the line of nooscillation or of suspension; K K, brushes on insulating-pieces 7;. L isthe stationary armature of the motor, arranged in the form of aPacinotti'ring. The magnet H is in the form of a'ring with a socketedarch as a third arm below, and two poles of soft iron projecting alittle beyond the remainder of the ring after being wound with the wire.The three magnets joining at the poles can be wound in multiple are orin series, as desired, so as to produce only two poles at the points Nand S. The armature L is wound like an ordinary Gramme or Pacinottiring, and the twelve coils shown each connected with one of the pointsion the commutator.

The commutator is placed on the line where the oscillation is at zero.The twelve wires M from the armature traverse the inner line of dots,Fig. 2, and are connected to the twelve white conducting-divisions ofthe commutator. ,The wires ll' M, connecting the source of electricitywith the apparatus,pass, respect ively, the one to the spindle O and theother down through the inner ring of dots in Fig. 2 to the middle orconducting ring of the commutator.

The course of the current is as follows: It enters through thebinding-screw m and traverses the wire M, passing down through thespindle C to the metal of the field-magnet, thence round the coils ofthe magnet, out at the brush K,through one of the sections of thecommutator, to the opposite section, thence, by means of the doublebrush K,-through the center conducting-ring, to the wire M, connectingwith the binding-screw m.

The armature L is supported to the beam F by bolts passing through theinsulating-block f to the beam F. It will be seen that,the commutatorbeing on the zero-line of oscillation, no amount of oscillation in thesuspended cage could hurt its working, the magnets poles being also inthe same zero-line.

I claim as my invention 1. In a centrifugal machine, the combination ofthe annular magnet H, fixed concentrically to the shaft to be driven,the annular armature L, just clearing the magnet and held stationary,and the commutator, I placed in side the magnet and held stationary, allas nearly as practicable in the same plane with the point of suspension,substantially as described,

2. The combination, with a flexible suspension-j oint for centrifugalmachines,0f the fieldlnagnet of an electric motor fixed to the shaft tobe driven, and a flXGd armature having its commutator so placed that thecenter of the pole-pieces, the contact'surface of the commutator, andthe zero-line of oscillation shall all be in the same plane,substantially as shown and described.

3. In electrical driving apparatus for centrifugal machines, a ringelectro-magnet fixed t0 the shaft to be driven by an arched bar inmagneticcontact therewith, the whole forming a single magnet with threebars all wound with wire, substantially as described.

4. The combination, with the suspensionbracket D and suitable elasticpacking, of the shafts O and B, and the commutator I, supported by saidbracket and insulated therefrom, and the magnet II, attached to the saidshaft 13 and revolving around the commutator and inside the stationaryarmature L, substantially as described.

5. In electrical driving apparatus for centrifugal machines, thecombination, with the shafts B and G, of the triple electromagnet H, thefixed armature L, and commutator I, the brushes K, attached to andmoving with the said magnet II, and suitable conductingwircs, allsubstantially as described and shown.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ALEXANDER WATT.

Vitnesses:

l. Ownnn OBurnn, WM. P. THOMPSON.

